<template>
	<view :class="{'pickerMask':visable}" @click="maskClick" @touchmove.stop.prevent="returnHandle">
		<view class="picker-box" :class="{'picker-show':visable}">
			<view class="operate-box" @touchmove.stop.prevent="returnHandle" @tap.stop="returnHandle">
				<view class="time-box">
					<view @click="touchSelect(0)" class="time-item" :style="{color:touchIndex?'#000000':themeColor}">
						<text>{{startText}}</text>
						<text>{{resultDate[0]}}</text>
					</view>
					<text>至</text>
					<view @click="touchSelect(1)" class="time-item" :style="{color:touchIndex?themeColor:'#000000'}">
						<text>{{endText}}</text>
						<text>{{resultDate[1]}}</text>
					</view>
				</view>
				<view :style="{color:themeColor}" @click="pickerConfirm">确定</view>
			</view>
			<picker-view :value="pickerValue" @change="pickerChange" class="picker-view"
				:indicator-style="indicatorStyle" @tap.stop="returnHandle">
				<picker-view-column>
					<view class="picker-item" v-for="(item, index) in years" :key="index">{{item}}年</view>
				</picker-view-column>
				<picker-view-column>
					<view class="picker-item" v-for="(item, index) in months" :key="index">{{ item }}月</view>
				</picker-view-column>
				<picker-view-column v-if="days.length > 0">
					<view class="picker-item" v-for="(item, index) in days" :key="index">{{ item }}日</view>
				</picker-view-column>
			</picker-view>
		</view>
	</view>
</template>
<script>
	export default {
		name: 'termPicker',
		props: {
			visable: {
				type: Boolean,
				default: false
			},
			defaultDate: {
				type: Array,
				default: () => []
			},
			minYear: {
				type: Number,
				default: 1990,
			},
			themeColor: {
				type: String,
				default: '#9D60FF'
			},
			startText: {
				type: String,
				default: '开始时间'
			},
			endText: {
				type: String,
				default: '结束时间'
			}
		},
		data() {
			const date = new Date();
			const years = [];
			const year = date.getFullYear();
			const months = [];
			const month = date.getMonth() + 1;
			const day = date.getDate();
			for (let i = this.minYear; i <= date.getFullYear(); i++) {
				years.push(i);
			}
			for (let i = 1; i <= 12; i++) {
				months.push(i);
			}
			return {
				indicatorStyle: 'height: 100rpx;',
				touchIndex: 0,
				year,
				month,
				day,
				years,
				months,
				days: [],
				pickerValue: [],
				resultDate: []
			};
		},
		mounted() {
			this.setDate()
		},
		methods: {
			returnHandle() {},
			setDate() {
				if (this.defaultDate.length > 0) {
					let date = this.defaultDate[0]
					this.resultDate = this.defaultDate
					this.setPicker(date)
				} else {
					let month = this.month < 10 ? '0' + this.month : this.month
					let day = this.day < 10 ? '0' + this.day : this.day
					let nowTime = this.year + '-' + month + '-' + day
					this.resultDate = [nowTime, nowTime]
					this.setPicker(nowTime)
				}
			},
			setPicker(date) {
				const splitVal = date.split('-')
				let year = this.years.indexOf(Number(splitVal[0]))
				let month = Number(splitVal[1]) - 1
				let day = Number(splitVal[2]) - 1
				this.pickerChange({
					detail: {
						value: [year, month, day]
					}
				})
			},
			touchSelect(val) {
				let date = this.resultDate[val]
				this.touchIndex = val
				this.setPicker(date)
			},
			getDateTime(date) {
				let year = this.years[date[0]]
				let month = this.months[date[1]]
				let day = this.days[date[2]]
				if (month < 10) {
					month = '0' + month
				}
				if (day < 10) {
					day = '0' + day
				}
				this.resultDate[this.touchIndex] = year + '-' + month + '-' + day
			},
			pickerChange(e) {
				const currents = e.detail.value;
				if (currents[1] + 1 === 2) {
					this.days = [];
					if (
						((currents[0] + this.minYear) % 4 === 0 &&
							(currents[0] + this.minYear) % 100 !== 0) ||
						(currents[0] + this.minYear) % 400 === 0
					) {
						for (let i = 1; i < 30; i++) {
							this.days.push(i);
						}
					} else {
						for (let i = 1; i < 29; i++) {
							this.days.push(i);
						}
					}
				} else if ([4, 6, 9, 11].some((item) => currents[1] + 1 === item)) {
					this.days = [];
					for (let i = 1; i < 31; i++) {
						this.days.push(i);
					}
				} else if (
					[1, 3, 5, 7, 8, 10, 12].some((item) => currents[1] + 1 === item)
				) {
					this.days = [];
					for (let i = 1; i < 32; i++) {
						this.days.push(i);
					}
				}
				this.pickerValue = currents
				this.getDateTime(currents)
			},
			maskClick() {
				this.$emit('update:visable', false)
			},
			pickerConfirm() {
				const {
					resultDate
				} = this
				let startTime = new Date(resultDate[0]).getTime()
				let endTime = new Date(resultDate[1]).getTime()
				let nowTime = new Date().getTime()
				if (startTime <= endTime && endTime <= nowTime) {
					this.$emit('confirm', resultDate)
					this.maskClick()
				} else {
					uni.showToast({
						title: '时间范围不正确！',
						icon: 'none'
					})
				}
			}
		}
	}
</script>

<style lang="scss" scoped>
	.pickerMask {
		position: fixed;
		z-index: 998;
		top: 0;
		right: 0;
		left: 0;
		bottom: 0;
		background: rgba(0, 0, 0, 0.6);
	}

	.picker-box {
		position: fixed;
		bottom: 0;
		left: 0;
		width: 100%;
		transition: all 0.3s ease;
		transform: translateY(100%);
		z-index: 998;

		.operate-box {
			display: flex;
			align-items: center;
			justify-content: space-between;
			padding: 18rpx 30rpx;
			background-color: #FFFFFF;
			text-align: center;
			font-size: 30rpx;
			border-bottom: 2rpx solid #e5e5e5;

			.time-box {
				width: 60%;
				display: flex;
				align-items: center;
				justify-content: space-between;

				.time-item {
					display: flex;
					flex-direction: column;
				}
			}
		}
	}

	.picker-show {
		transform: translateY(0);
	}

	.picker-view {
		width: 750rpx;
		height: 600rpx;
		background-color: #FFFFFF;

		.picker-item {
			height: 100rpx;
			display: flex;
			align-items: center;
			justify-content: center;
			text-align: center;
		}
	}
</style>